213012643 has 2 divisors, whose sum is σ = 213012644. Its totient is φ = 213012642.

The previous prime is 213012619. The next prime is 213012647. The reversal of 213012643 is 346210312.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213012643 is a prime.

It is not a weakly prime, because it can be changed into another prime (213012647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106506321 + 106506322.

It is an arithmetic number, because the mean of its divisors is an integer number (106506322).

Almost surely, 2^213012643 is an apocalyptic number.

213012643 is a deficient number, since it is larger than the sum of its proper divisors (1).

213012643 is an equidigital number, since it uses as much as digits as its factorization.

213012643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 213012643 is about 14594.9526549421. The cubic root of 213012643 is about 597.2210778939.

Adding to 213012643 its reverse (346210312), we get a palindrome (559222955).

The spelling of 213012643 in words is "two hundred thirteen million, twelve thousand, six hundred forty-three".